Two studies show that concentrations of flame-retardant compounds known as PBDEs and HBCDs are decreasing in wildlife in Canada and Norway, indicating that government policies to reduce the chemicals are working. The studies show the levels of PBDEs plateauing or declining after the mid-1990s, while results were mixed on the levels of HBCDs. The most common types of the chemicals are banned or restricted in some countries, including parts of the U.S.

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